Reinstate previous behavior of notifying the graph listener of GET_BATCH for every DEP_REQUESTED call.

Recent optimizations in 62d1b0b and 243c2b7 mean that deps can now be requested via `get()` instead of `getBatch()`. It is possible that existing regression tests are no longer WAI because they are not getting the `GET_BATCH` event (i.e. they are passing but not testing what they intend to).

Restoring the previous behavior is much easier than hunting down every test that is affected.

PiperOrigin-RevId: 479416036
Change-Id: Iea3ac0a2ad02313dc8e61084fa5f585763a5967f

Author: justinhorvitz

src/test/java/com/google/devtools/build/skyframe/NotifyingHelper.java

@@ -80,6 +80,12 @@ static class NotifyingProcessableGraph implements ProcessableGraph {
     @Override
     public NodeEntry get(@Nullable SkyKey requestor, Reason reason, SkyKey key)
         throws InterruptedException {
+      // Maintains behavior for tests written when all DEP_REQUESTED calls were made as batch
+      // requests. Now there are optimizations in SkyFunctionEnvironment for looking up deps
+      // individually, but older tests may be written to listen for a GET_BATCH event.
+      if (reason == Reason.DEP_REQUESTED) {
+        notifyingHelper.graphListener.accept(key, EventType.GET_BATCH, Order.BEFORE, reason);
+      }
       return notifyingHelper.wrapEntry(key, delegate.get(requestor, reason, key));
     }